<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        img {
            width: 200px;
            height: 200px;
        }

        .Active {
            border: 1px solid red;
        }
    </style>
</head>

<body>
    <div id="app">
        <img v-bind:src="imgSrc" alt="">
        <br>
        <img :src="imgSrc" alt="" :title="imgTitle+'!!'" :class="isActive? 'Active': ''" @click="click">
        <br>
        <img :src="imgSrc" alt="" :title="imgTitle+'!!'" :class="{Active:isActive}" @click="click">

    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                imgSrc: "./img/1.jpg",
                imgTitle: "加油",
                isActive: false,
            },
            methods: {
                click() {
                    this.isActive = !this.isActive
                }
            }

        })
    </script>
</body>

</html>